Coding device, coding method, decoding device, decoding method, and program

Abstract

To reduce data amount while ensuring tactile reproducibility of a two-dimensional tactile signal, and improve the efficiency of a system related to tactile reproduction. Coding is performed to compress information amount by orthogonally transforming a two-dimensional tactile signal based on a time signal. By orthogonally transforming a two-dimensional tactile signal based on a time signal, it is possible to compress information amount by removing frequency components that are difficult for humans to perceive, as in the case of an image signal, for example. Accordingly, it is possible to reduce data amount while ensuring tactile reproducibility of a two-dimensional tactile signal, and improve the efficiency of a system related to tactile reproduction.

The invention claimed is: 
     
       1. A coding device comprising
 a coding unit that performs coding of compressing information amount by orthogonally transforming a two-dimensional tactile signal based on a time signal; 
 wherein the coding unit decodes coded data in which the information amount is compressed by extracting a frequency component whose absolute value of an orthogonal transform coefficient is equal to or greater than a threshold. 
 
     
     
       2. The decoding device according to  claim 1 , wherein
 the threshold is a threshold determined on a basis of a human tactile characteristic. 
 
     
     
       3. A coding method comprising
 performing coding of compressing information amount by orthogonally transforming a two-dimensional tactile signal based on a time signal; 
 wherein the coding decodes coded data in which the information amount is compressed by extracting a frequency component whose absolute value of an orthogonal transform coefficient is equal to or greater than a threshold. 
 
     
     
       4. A program that causes an information processing apparatus to achieve a function of performing coding of compressing information amount by orthogonally transforming a two-dimensional tactile signal based on a time signal;
 wherein the coding decodes coded data in which the information amount is compressed by extracting a frequency component whose absolute value of an orthogonal transform coefficient is equal to or greater than a threshold. 
 
     
     
       5. A decoding device comprising
 a decoding unit that decodes coded data obtained by performing coding of compressing information amount by orthogonally transforming a two-dimensional tactile signal based on a time signal; 
 wherein the decoding unit decodes the coded data in which the information amount is compressed by extracting a frequency component whose absolute value of an orthogonal transform coefficient is equal to or greater than a threshold. 
 
     
     
       6. The decoding device according to  claim 5 , wherein
 the decoding unit 
 decodes the coded data in which information amount is compressed by extracting a low-frequency component. 
 
     
     
       7. The decoding device according to  claim 5 , wherein
 the decoding unit 
 decodes the coded data in which information amount is compressed on a basis of a human tactile characteristic. 
 
     
     
       8. The decoding device according to  claim 7 , wherein
 the decoding unit 
 decodes the coded data in which information amount is compressed on a basis of a tactile characteristic of each receptor. 
 
     
     
       9. The decoding device according to  claim 8 , wherein
 the decoding unit 
 decodes the coded data in which information amount is compressed by extracting a representative value of an orthogonal transform coefficient in the vicinity of a peak frequency of a sensitivity of the receptor. 
 
     
     
       10. The decoding device according to  claim 9 , wherein
 the decoding unit 
 decodes the coded data in which a frequency index corresponding to the peak frequency of the sensitivity of the receptor is assigned as a frequency index of the representative value. 
 
     
     
       11. The decoding device according to  claim 5 , wherein
 the decoding unit 
 decodes the coded data in which information amount is compressed on a basis of a device characteristic, which is a frequency characteristic of a tactile presentation device. 
 
     
     
       12. The decoding device according to  claim 11 , wherein
 the decoding unit 
 decodes the coded data in which information amount is compressed on a basis of the device characteristic of a plurality of tactile presentation devices. 
 
     
     
       13. The decoding device according to  claim 11 , wherein
 the decoding unit 
 decodes the coded data in which information amount is compressed by extracting a representative value of an orthogonal transform coefficient in the vicinity of a peak frequency of the device characteristic. 
 
     
     
       14. The decoding device according to  claim 13 , wherein
 the decoding unit 
 decodes the coded data in which a frequency index corresponding to the peak frequency of the device characteristic is assigned as a frequency index of the representative value. 
 
     
     
       15. The decoding device according to  claim 11  further comprising an information transmission unit that transmits information for identifying the device characteristic to an external device. 
     
     
       16. The decoding device according to  claim 5 , wherein
 the decoding unit 
 decodes the coded data in which information amount is compressed by extracting a representative value of an orthogonal transform coefficient from a frequency band corresponding to a static tactile sensation and a frequency band corresponding to a dynamic tactile sensation. 
 
     
     
       17. The decoding device according to  claim 16 , wherein
 the decoding unit 
 decodes the coded data in which a frequency of including the representative value extracted from the frequency band corresponding to the static tactile sensation is set lower than a frequency of including the representative value extracted from the frequency band corresponding to the dynamic tactile sensation. 
 
     
     
       18. A decoding method comprising
 decoding coded data obtained by performing coding of compressing information amount by orthogonally transforming a two-dimensional tactile signal based on a time signal; 
 wherein the decoding decodes coded data in which the information amount is compressed by extracting a frequency component whose absolute value of an orthogonal transform coefficient is equal to or greater than a threshold. 
 
     
     
       19. A program that causes an information processing apparatus to achieve a function of decoding coded data obtained by performing coding of compressing information amount by orthogonally transforming a two-dimensional tactile signal based on a time signal;
 wherein the coding decodes the coded data in which the information amount is compressed by extracting a frequency component whose absolute value of an orthogonal transform coefficient is equal to or greater than a threshold.